/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/Framework/PhysicsSolverBase.h
Base solver class storing events that will be used by the derived solver during the solve. Currently used by caching but could be used for any other pre/post solve works that need to be done.
class FPhysicsSolverEvents
FSolverPostAdva...
EventPostSolve
FSolverPreBuffe...
EventPreBuffer
FSolverPreAdvan...
EventPreSolve
Storage for events, see the Add/Remove pairs above for event timings
FSolverTeardown
EventTeardown